Display panel,method of photo alignment and driving method of the display panel

Abstract

The present application discloses a display panel, a method of photo alignment and a driving method of the display panel. A display area of the display panel is divided into at least a first area and a second area, light transmittance of the first area is different from that of the second area when driven by the identical voltage difference, and pre-tilt angles of liquid crystal molecules corresponding to the first area are different from those of liquid crystal molecules corresponding to the second area.

What is claimed is: 
     
       1. A display panel, comprising:
 a first substrate; 
 a second substrate, disposed opposite to the first substrate; and 
 a liquid crystal layer, disposed between the first substrate and the second substrate; 
 
       wherein a display area of the display panel is divided into at least a first area and a second area, and light transmittance of the first area is different from light transmittance of the second area when driven by the identical voltage difference; 
       pre-tilt angles of liquid crystal molecules corresponding to the first area are different from pre-tilt angles of liquid crystal molecules corresponding to the second area; 
       wherein the display panel comprises:
 a plurality of pixel electrodes, disposed on the first substrate; 
 a first common electrode; and 
 a second common electrode; 
 
       wherein the first common electrode and the second common electrode are disposed on the second substrate with a spacer disposed between the first common electrode and the second common electrode for insulation from each other; 
       the first common electrode is overlapped with the corresponding pixel electrodes to form a first area, and the second common electrode is overlapped with the corresponding pixel electrodes to form a second area; 
       the pre-tilt angles of the liquid crystal molecules in the liquid crystal layer corresponding to the first area are different from the pre-tilt angles of the liquid crystal molecules in the liquid crystal layer corresponding to the second area, and the pre-tilt angles are formed by controlling the first common electrode and the second common electrode to connect with different common voltages in an alignment stage; 
       wherein the display panel further comprises a common line, and a projection of the common line is disposed corresponding to the spacer between the first common electrode and the second common electrode. 
     
     
       2. The display panel according to  claim 1 , wherein the light transmittance of the first area is lower than the light transmittance of the second area, and the ratio of the area of the first area to the area of the second area is 1.5 to 2.3. 
     
     
       3. The display panel according to  claim 2 , wherein the pixel electrodes comprise a first trunk, a second trunk and a plurality of branches, the first trunk and the second trunk intersect perpendicularly to divide the pixel electrodes into a plurality of alignment areas, the branches positioned in a plurality of alignment areas are connected to the first trunk or the second trunk, and the first trunk or the second trunk corresponds to the first area. 
     
     
       4. The display panel according to  claim 1 , wherein the spacer between the first common electrode and the second common electrode is overlapped with the pixel electrodes. 
     
     
       5. The display panel according to  claim 4 , wherein the pixel electrodes comprise a first trunk, a second trunk and a plurality of branches, the first trunk and the second trunk intersect perpendicularly to divide the pixel electrodes into a plurality of alignment areas, the branches are connected to the first trunk or the second trunk, and the branches are positioned in the alignment areas;
 the first trunk or the second trunk is disposed corresponding to the spacer between the first common electrode and the second common electrode. 
 
     
     
       6. The display panel according to  claim 1 , wherein the pre-tilt angles are angles between long axes of the liquid crystal molecules in the liquid crystal layer and the first substrate. 
     
     
       7. The display panel according to  claim 1 , wherein the liquid crystal layer comprises negative liquid crystal molecules mixed with a reactive monomer. 
     
     
       8. The display panel according to  claim 1 , wherein the surface of the first substrate is coated with polyimide as an alignment base material. 
     
     
       9. A display panel, comprising:
 a first substrate; 
 a second substrate, disposed opposite to the first substrate; and 
 a liquid crystal layer, disposed between the first substrate and the second substrate; 
 
       wherein a display area of the display panel is divided into at least a first area and a second area, and light transmittance of the first area is different from light transmittance of the second area when driven by the identical voltage difference; 
       pre-tilt angles of liquid crystal molecules corresponding to the first area are different from pre-tilt angles of liquid crystal molecules corresponding to the second area; 
       wherein the display panel comprises:
 a plurality of pixel electrodes, disposed on the first substrate; 
 a first common electrode; and 
 a second common electrode; 
 
       wherein the first common electrode and the second common electrode are disposed on the second substrate with a spacer disposed between the first common electrode and the second common electrode for insulation from each other; 
       the first common electrode is overlapped with the corresponding pixel electrodes to form a first area, and the second common electrode is overlapped with the corresponding pixel electrodes to form a second area; 
       the pre-tilt angles of the liquid crystal molecules in the liquid crystal layer corresponding to the first area are different from the pre-tilt angles of the liquid crystal molecules in the liquid crystal layer corresponding to the second area, and the pre-tilt angles are formed by controlling the first common electrode and the second common electrode to connect with different common voltages in an alignment stage; 
       wherein the first common electrode comprises a first vertical portion and a plurality of first horizontal portions, the first vertical portion is in communication with the first horizontal portion, the first horizontal portion extends in a direction perpendicular to the first vertical portion, and the plurality of first horizontal portions are disposed in parallel along a scanning line direction of the display panel with two adjacent first horizontal portions spaced from each other; 
       the second common electrode comprises a second vertical portion and a plurality of second horizontal portions, the second vertical portion is in communication with the second horizontal portion, the second horizontal portion extends in a direction perpendicular to the second vertical portion, and the second horizontal portions are disposed in parallel with two adjacent second horizontal portions spaced from each other and a spacer disposed between adjacent first horizontal portion and second horizontal portion. 
     
     
       10. The display panel according to  claim 9 , wherein the first common electrode is connected to a first test pad; the second common electrode is connected to a second test pad; the first test pad and the second test pad are disposed on the identical side as the first vertical portion. 
     
     
       11. The display panel according to  claim 9 , wherein the width of the first horizontal portions is larger than the width of the second horizontal portions. 
     
     
       12. The display panel according to  claim 9 , wherein the plurality of pixel electrodes form a display area; the first vertical portion is outside the display area, and the second vertical portion is partially overlapped with the display area.